README web version of /home/usg/OPS/MTS/readme_xml/readme_77006601

Principal Investigator Email Address

```
maceroni@mporzio.astro.it
```

Estimated Total Execution Time (hours, including overheads)

```
3h
```

General Description

The aim of this program is to obtain the radial velocity MAXIMA of a close
 binary, BW3V38. The orbital period is P = 4h 46m (0.19839d). The exposures cannot
 be longer than 900s, to avoid phase smearing. The non-standard central WL (800nm)
 is necessary to get Halpha in a good position on the EEV CCD.

The two maxima, being the orbit circular, are 2h23m apart. so that the three hours
 alloted to the program are really the shortest time interval to get the needed data.
 This program  has  therefore STRICT timing constraints (see section). 
In short, observations shall be performed  applying  strict constraints at the extremes
 of the 3h time interval: a first 1h-OB to be executed a start and another at start+2h.

Between these two OBs exposures of a template star and a telluric standard shall
 be taken.

OBs description
---------------------------------
OBs for the main science target:
---------------------------------
bw3v38x3_1 and _2 identical series of three exposures. One shall be executed right
 at 				the beginning of the run, the other 2h later, to be sure of covering 				the
 maxima. Exec time: 57m


bw3v38_fill 	is a similar single exposure to be executed in case of time left after
 
		observing template and standard. Exec time: 24m

---------------------------------
 OBs for the template star GJ729:
---------------------------------
GJ729_60sx2     	two exposures of the target. 

---------------------------------
OBs for the telluric standard 
(choice of the target according to observability)
---------------------------------

HD161633_x2      	two exposures of the target

Feige67_x2        	two exposures of the target


The normal calibration procedure (with the non-standard setting) will be sufficient

Waiver Requests

```
A Waiver Request has been approved
```

Critical Observing Condition Constraints

If the observations are performed in bright time the distance from the
 moon constraint is very strong.

Time-Critical Aspects

observing strategy:  
table Ephemeris provides time t_start ant t_end, i.e. start and end of observations
 (full
duration assumed to be 3h). The  exposure of the   main scientific target last ~1h
 (57m).

there is a  strict timing  constraint:  OB BW3_V38x3_1 shall be executed at time
 t_start  AND BW3_V38x3_2 at t_start+2h, (i.e. t_end-1h). These OBs have the highest
 priority. 

Whatever OBs is in execution at t_start+2h, shall be interrupted to execute BW3_V38x3_2.
For DETAILED INSTRUCTIONS see Special Execution requirements section.

The template star GJ729 cannot be observed at meridian. If, for chosen observation
 date,  GJ729 is at meridian during the 2nd hour of the run, it can be observed before
 executing BW3_V38x3_1  or after BW3_V38x3_2 (respecting however these OBs timing
 constraints)

Special Execution Requirements

BW3V38 is in a crowded field and has a nearby (2.5") brighter orbital
 companion.
The slit shall be oriented to have both stars on it (see FC). This is taken into
 account in the OBs with (presumably) proper angle. 

Detailed instructions for timings:

1) start observations at t_start, i.e. just before  one maximum (see the ephemeris
 file) with OB BW3_V38x3_1. The exposure should start at the time indicated in the
 ephemeris-table. Please take into account the time for pointing,  to match as much
 as possible the starting time with the actual beginning of exposure. Estimated exec
 time of first OB: 57min.

2) move to template GJ729, with OB GJ729_x2.
 
3) move to telluric standard Feige67 or HD161633, depending on observability, with
 the correspondin name_x2 OB.

4) only if time is left before t_end-1h execute BW3_V38_fill, this is identical
 to the main OB but for  a single exposure, predicted exec time 24m
  
5)  at t_end-1h = t_start+2h, execute the OB BW3_V38x3_2

----------
Notes:

A) if template and telluric standard OBs cannot be executed between 1) and 5), they
 can as well be executed at other times of the same night, the central hour can be
 filled with  bw3_v38_fill.
 
B) GJ729, because of its declination, cannot be observed at meridian.

C) In a few nights more than one interval OF THE SAME TYPE (see the last column
 of the ehemeris file) is available. In this case OB BW3_V38x3_1 could also be executed
 at the beginniing of any of those interval and OB BW3_V38x3_2 one hour before the
 end of the other of the SAME TYPE.

Special Calibration Information

```
no special calibration required
```

ToO Information

---(Empty)---

ToO Activators List

---(Empty)---

Is this a Pre-imaging run ?

```
false
```

Pre-imaging Requirements

---(Empty)---

Source(s) of Pre-imaging

---(Empty)---

Pre-imaging sources not listed above

---(Empty)---

Do all your OBs comply with the instrument-specific requirements listed on the instrument-specific Phase 2 web page ?

```
N/A
```

If this is a pre-imaging run, did you select PRE-IMAGING for the Observing Category for each Observing Template ?

```
N/A
```

Do all your finding charts comply with both the general and instrument-specific Phase 2 Web Pages ?

If you submitted OBs for standard stars, did you specify the magnitude and spectral type of all standard stars in the OBs ?

Have you included OBs for any calibrations that you need but which are not part of the Calibration Plan ?

```
N/A
```

If you are observing Moving Targets, have you attached suitable ephemeris files to your OBs?

If you have preferences which OBs should be executed first, did you make use of the User Priority field in the OBs ?

If this is a run that requires coordinated observations with other facilities, did you give proper instructions in the Time-Critical Aspects Section ?

If you need secondary guiding, are there suitable objects within 30 arcsec from your target ?

```
N/A
```

Last creation of page: Tue Oct 6 15:40:12 2009
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